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<br /> <br />000894 <br />4It Trinidad, SPb is the April 1 snow water equivalent at the <br />Bourbon snow course and Qvb is the annual flow of Van Bremer <br />Arroyo. All flows are in acre-feet and snow water equiva- <br />lent in inches. April 1 snow data is used since it gener- <br />ally represents the maximum accumulation available for <br />stream flow. Standard errOrs of regression coefficients are <br />given in parenthesis below the equation. The coefficient of <br />multiple correlation and the standard error of estimate for <br />this equation are 0.93 and 7,600 acre-feet (27 percent of <br />mean annual flow), respectively. These are better than any <br />obtained for lengthened record MLR's. <br /> <br />. <br /> <br />As an aid in understanding the physical significance of <br />the variables in equation A, the following conce?ts are pre- <br />sented. A simplified mass balance of the hydrologic system <br />can be presented as the equation <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I- <br />I <br /> <br />mountain snow pack runoff + mountain rainfall <br />runoff - consumptive use + plains precipitation <br />runoff + storage change = flow at Thatcher <br />(B) <br /> <br />A distinction between mountain precipitation types is neces- <br />sary for this discussion since the two are consumptively <br />used to varying degrees. The storage change term includes <br />influent or effluent groundwater effects and is assumed <br />negligible on an annual basis. <br /> <br />-17- <br />